Improvement in fire-stops for steam-boiler flues



G. S. DEAN. Fire-Stop for steam Boiler Flues.

No. 215,583. Patented- May 20,1879.

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CYRUS S. DEAN, OF CROWLAND, ONTARIO, CANADA, ASSIGNOR TO CHARLES H. VIBBARD AND NICHOLAS LANSING ZABRISKIE, OF AURORA, N. Y.

IMPROVEMENT IN FIRE-STOPS FOR STEAM-BOILER FLUES.

Specification forming part of Letters Patent No. 215,583, dated May 20, 1879; application filed March 31, 1879.

To all whom it may concern:

Be it known that I, CYRUs S. DEAN, of Crowland, in the county of Welland, Prov-' ince of Ontario, Canada, have invented anew and useful Improvement in Fire-Stops for Steam-Boiler Flues, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to that class of firestops for boiler flnes or tubes which are made of less diameter than the flues and arranged within the flues in a series with intermediate spaces, whereby the flame and products of combustion are held or retarded in their passage through the fines and deflected against the inner walls of the flnes, thereby enabling the fines to absorb and utilize a greater quantity of heat than is possible when the flues are unobstructed from end to end.

For a more particular description of these stops, reference is here made to Letters Patent of the United States No. 172,302, granted tome for such stops January 18, 1876.

My present invention has for its object to simplify the construction of said stops and enable the stops to be readily placed in the flues, and to be withdrawn therefrom when necessary. I

My invention consists, to that end, of afluestop composed of two deflectors connected by longitudinal ribs; also, in providing the ribs of the stops with elongated openings adapted to receive the hooked end of the rod or bar by which the stops are connected.

In the accompanying drawings, Figure 1 is a sectional elevation of a boilerflue provided with my improved stops. Fig. 2 is a side elevation on an enlarged scale of one of my improved stops. Fig. 3 is an end view thereof. Fig. at is a cross-section in line a: as, Fig. 2, showing the connectingbar in the proper position tohook into the elongated opening of the stop.

Like letters of reference refer to like parts in the several figures.

A represents the flue, and '13 represents my improved tire-stops arranged therein. The

stops B are each composed of two conical deflectors, C C, connected by longitudinal ribs or plates D, which intersect each other and leave an open space between the deflectors. By this construction the stops are rendered light and strong, and the flame is permitted to freely play between the deflectors.

In the drawings, two plates, D D, are shown intersecting each other at right angles; but any desired number may be employed. The plates 1) are provided with projections d, fitting within the .tubes or fines, so that when the stops are inserted therein the deflectors C will be held centrally within the fines. One or more of the plates D are provided with elongated openings f, arranged at right angles to the axis of the stops.

9 represents the bars or rods by which the stops are connected and held at the proper distance apart. The ends of the bars 9 are bent over or formed in the shape of a hook, the bent portion being of such length as to pass easily through the elongated openings f, when the latter are arranged with theirlongest dimension in the line of the bent end of the bar.

The stops are placed in the fines one at a time, and connected by the hooked bars 9, as shown in Fig. 1.

The deflectors C of the different stops are preferably made gradually increasing in diameter from the fire-box flue-sheet H toward the smoke-box, as clearly shown in Fig. 1, in order to compensate for the tendency of the heated gases to taper down or contract in the center of the flue as they approach the smokebox.

When it is required to clean the flue, the

stops B are readily withdrawn therefrom and disconnected. Y

My improved fire-stops are readily and cheaply constructed of cast-iron, and effect CYRUS S. DEAN.

Witnesses:

EDWARD WILHELM, J NO. J. BONNER. 

